Bugfix: 'composer update' in release script
More detailed docblock in Utils class
Made SpaceApiObject independent of any Zend stuff and application logic.
Fixed SpaceApiObject::update(), the json should never be set if it can't be decoded, unit test added, application should handle wrong json and expect the SpaceApiObject's json unmodified
Docblocks updated, SpaceApiObject::save() and SpaceApiObject::validate() do nothing if validJson flag is set to false, unit test added.
Comments added, code improvements
More detailed comments for some twig filters